Garbage. save the money for an acro or holosun 509 - Swampfox Kraken Closed Emitter 1x16mm 3 MOA Dot Sight

I bought two of these due to marketing. Thought it would be a tough closed emitter optic with all the videos so I gave it a try. Mounted one on my Glock 17 and after 400 rounds, a piece of the emitter somehow broke off and was floating around the inner lens. Same thing happened to the second one mounted on my Glock 26 however the optic also would not turn on even after new batteries were installed. Stay way and save up for a Holosun 509 or an Acro. Very disappointed.